Bedienungsanleitung Roland D-Bass 115 (Seite 8 von 24) (Englisch)

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Main Features

The

D-BASS 210

and

115

are powerful yet lightweight professional bass amps, which utilize Roland’s FFP technology

incorporating new Active Speaker Control. The

D-BASS 115X

is a powered extension speaker.

Stacking the D-BASS 210/115 and the D-BASS 115X lets you create an even more powerful system.

D-BASS 210/115/115X Shared Features

■

High-Power, Multi-Amp Configuration................................................................

The D-BASS features a multi-amp arrangement with each speaker unit driven by its own dedicated power amp. Combined with

signal processing optimized for each unit’s particular frequency response, this drives each of the speakers in the ideal manner.

■

Thorough Weight Reduction ...............................................................................

• Newly developed custom speakers make use of new

materials, succeeding in cutting the weight of previous

models by half for the 10” speaker and one-third for the

15” speaker (as compared with previous Roland

products). Moreover, stronger magnetic force ensures

quick response with effective damping in the lower

frequencies.

• Use of D-Class power amps and switching power

supplies for high energy conversion efficiency reduces

generation of unnecessary heat. This permits use of

smaller, lighter power transformers and heat sinks.

• New cabinet designs make use of new materials and

reduce unwanted vibration, resulting in cabinets that are

lighter overall, yet still ensure ample ruggedness.

■

Advanced FFP Technology Incorporating Active Speaker Control.........................

• These units employ Roland’s proprietary FFP amp

technology for dynamic, powerful sound that exceeds

specs, while D-BASS’s incorporation of Active Speaker

Control technology realizes even higher quality sound.

• Active Speaker Control uses an optical sensor to monitor

the movement of the speaker and correct discrepancies

between the original sound and the speaker motion. This

results in faithful reproduction of the Instrument's

original sound characteristics and the nuances produced

in performance.

FFP (Feed Forward Processing)

is system control

technology that optimizes the performance of the amp,

speakers, and cabinet characteristics according to the signals

being input, based on the results of analyses of the operation

and behavior of each section of existing amp systems.

D-BASS 210

D-BASS 115 D-BASS 115X

Speaker Configuration

25 cm (10 inches) x 2 + Tweeter

38 cm (15 inches) + Tweeter 38 cm (15 inches) + Tweeter

Power Amp Configuration

160 W x 2 + 80 W (Tweeter)

250 W + 80 W (Tweeter) 250 W + 80 W (Tweeter)

Total Output Power

400 W

330 W 330 W

Conceptual Diagram of Active Speaker Control

Preamp

Speaker

Power Amp

Optical Sensor

Control

Input

FFP

Speaker motion

monitored

● Conventional Bass Amps

With conventional bass amps, input signals are amplified by the

power amp, and then the sound is output by means of the

vibration of the speaker, but discrepancies occur between the

signals output from the power amp and the actual vibration of

the speaker. Observations of speaker motion when bass sounds

are played reveal delayed response in the attack and release and

superfluous vibration. Such discrepancies stem from the basic

mechanical properties of the cone speaker construction, and are

especially noticeable in the low-frequency range. These

discrepancies result in a loss of clarity and definition in the bass

sound.

● How Active Speaker Control Works

With Active Speaker Control, the speaker movement is

monitored in real time with an optical sensor to detect any

deviation from the input signal. Any such discrepancies are

corrected by a digital signal processor, thus controlling speaker

motion to reproduce the input signal as closely as possible.

● Effect of Active Speaker Control

Active Speaker Control affects the actual bass sound in the

following ways.

• Speaker amplitude linearity is improved, producing a

tight, powerful sound with better contour. In particular,

this technology provides faithful reproduction of the low

end for basses with Low-B string.

• This allows the range of frequencies reproduced to be

extended further in the low end, expanding the frequency

range of the bass sound.

• The speakers are drives in a way that creates a sound truer

to the input signal, providing with greater responsiveness.

Active Speaker Control

115X 210/115

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